HOT ADHESIVE-SUITABLE COPOLYAMIDE PREPARATION METHOD Russian patent published in 2004 - IPC

FIELD: polymer materials. SUBSTANCE: invention relates to a method for preparation of copolyamide, which may be used for manufacture of hot adhesives and hot-melting powders in chemical, textile, and clothing industries. Method consists in melting together 57-62% ε-caprolactam and 38-41% hexamethylenediammonium adipate (AG salt) at 90^o followed by polymerization at 240^o for 1 h. Further, 1-2% acryl powder as modifier is added containing 50% methyl methacrylate and 50% methyl acrylate, while simultaneously, during 5 h, raising temperature to 260^o and pressure to 1.5 MPa. After pressure is dropped to atmosphere value, polymer is discharged. EFFECT: lowered melting point and enhanced adhesion to textiles. 1 tbl, 38 ex